THAT Madonna‘s touring deejay, Enferno, will perform at UltraBar in DC before hitting the road with Madge for her European “Sticky & Sweet” tour . . . THAT Helena Christensen is in her birthday suit for the cover of Citizen magazine’s “Supermodel Issue,” following in the footsteps of Heidi Klum and Penelope Cruz . . . THAT Donnie Klang from MTV’s “Making of the Band” was snuggling with Erin Lucas of “The City” at the YRB mag bash at M2.